Pregnancy fetishism is a context where pregnancy is seen by individuals or cultures as an erotic phenomenon. The first explicit pegging scene is believed to have been in the 1975 pornographic film The Opening of Misty Beethoven. In hentai sex Canada, Teletoon offers up its own Teletoon at Night programming block. The definition clash also appears with the English definition of horny milfs yuri as any lesbian relationship, as opposed to its sexually explicit definition in Japan. While anal sex is commonly associated with male homosexuality, research shows that not all gay males engage in anal sex and that it is not uncommon in heterosexual relationships. Entacle erotica describes a type of pornography most commonly found in Japan which integrates traditional pornography with elements of bestiality and a fantasy, horror, or science-fiction theme. Bondage pornography specializes in the depiction of sexual bondage or BDSM activities as photographs, stories, movies, or drawings. Terminology for roles varies widely within the various BDSM subcultures. Solo performances in gay pornography have been described in 1985 as either or both active and/or passive , whereas female solo performances are said to be exclusively passive . Many fantasies include the macrophile shrinking before a normal sized woman or keeping his or her normal height while the partner grows in size. Solo pornography recognized with AVN Awards include the All Alone series and All Natural: Glamour Solos. The original definition of dogging – and which is still a closely related activity – is spying on couples having sex in a car or other public place. Threesome can also refer to a love triangle, a three-way romantic relationship. Comic books often featured characters being tied up and gaysex tying others up, particularly in damsel in distress plots. The term applies to the depiction of the act rather than the act itself, and so does not include live exhibitions like sex shows and striptease. Sexologist Alfred Kind suggested that the buttocks is the primary sexual presentation site in primates.